Broadcast Signal Frame Bootstrap and Preamble Signaling
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Solution Overview
Problem
Current broadcast signal transmission systems face challenges in efficiently signaling Bit-Interleaved Coded Modulation (BICM) modes and OFDM parameters, particularly in providing various Signal-to-Noise Ratios (SNRs) and simultaneously signaling BICM modes and OFDM parameters like constellation, code rate, FFT size, guard interval, and pilot pattern.
Innovation Solution
A broadcast signal frame structure is developed, incorporating a time interleaver and frame builder to generate a broadcast signal frame with a bootstrap and preamble, where the preamble includes L1-Basic and L1-Detail, and the bootstrap represents the structure of L1-Basic, using a symbol that signals BICM modes and OFDM parameters, including modes for QPSK, 16-NUC, and 64-NUC constellations with specific code rates, and varying parity repetition and puncturing sizes for different robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single fixed-length symbol is used to signal BICM modes and OFDM parameters, then the signaling efficiency is improved, but the ability to provide various SNRs and different robustness levels is limited
Solution Approach 1:
The signaling process is segmented into two distinct parts: a fixed-length symbol in the bootstrap for efficient basic parameter signaling, and variable-length L1-Basic signaling for detailed BICM mode and SNR information. This segmentation allows the system to achieve both signaling efficiency and adaptability to various SNR conditions.
Solution Approach 2:
The patent adds a temporal dimension to the signaling structure by separating bootstrap signaling from L1-Basic signaling in time. The bootstrap provides quick fixed-length signaling, while L1-Basic provides detailed variable-length information, enabling the system to efficiently signal both basic parameters and detailed BICM modes with various SNR levels.
2Adaptability or versatility
If multiple BICM modes with different constellations and code rates are signaled, then the adaptability to different SNRs is improved, but the signaling complexity increases
Solution Approach 1:
The signaling is segmented into bootstrap (fixed-length) and L1-Basic (variable-length) parts. The bootstrap handles basic OFDM parameters with a simple fixed-length symbol, while L1-Basic handles the more complex BICM mode signaling with variable length, reducing overall signaling complexity while maintaining mode variety.
Solution Approach 2:
The L1-Basic signaling length is made dynamic and adaptive based on the specific BICM mode being signaled. This dynamic approach allows the system to signal multiple BICM modes with different constellations and code rates without requiring a fixed maximum length, thereby reducing signaling complexity while maintaining adaptability.
3Loss of information
If a longer preamble is used to include detailed BICM mode information, then the signaling completeness is improved, but the transmission time increases
Solution Approach 1:
The frame structure is segmented into bootstrap (short, fixed-length) and preamble (longer, variable-length) portions. The bootstrap quickly transmits basic parameters in fixed length, while the preamble transmits detailed BICM mode information only when needed, reducing overall transmission time while maintaining signaling completeness.
Solution Approach 2:
The system uses partial action by transmitting only the necessary amount of BICM mode information in the L1-Basic portion of the preamble. Rather than always transmitting maximum detailed information, the system transmits only what is needed for the specific service and channel conditions, reducing transmission time while maintaining completeness.
Data Source
AI summary
An apparatus and method for broadcast signal frame using a bootstrap and a preamble are disclosed. An apparatus for generating broadcast signal frame according to an embodiment of the present invention includes a time interleaver configured to generate a time-interleaved signal by performing interleaving on a BICM output signal; and a frame builder configured to generate a broadcast signal frame including a bootstrap and a preamble using the time-interleaved signal.